czm_pixelSizeInMeters
An automatic GLSL uniform representing the size of a pixel in meters at a distance of one meter
from the camera. The pixel size is linearly proportional to the distance from the camera.
Like all automatic uniforms, czm_pixelSizeInMeters does not need to be explicitly declared.
However, it can be explicitly declared when a shader is also used by other applications such
as a third-party authoring tool.
Example
// GLSL declaration uniform float czm_pixelSizeInMeters; // Example: the pixel size at a position in eye coordinates float pixelSize = czm_pixelSizeInMeters * positionEC.z;